The possibility of using three natural Cu ore particles as oxygen carriers in the chemical looping with oxygen uncoupling (CLOU) was investigated. The reaction kinetics of Cu 2 O with O 2 and the decomposition kinetics of CuO in a CO 2 atmosphere at different temperatures and oxygen fractions were studied using thermogravimetric analysis (TGA). Both oxygen uptake and oxygen release exhibit a high reaction rate. Multiple oxygen uptake and oxygen release cycles indicated that three natural Cu ore oxygen carriers have high reactivity and cyclic stability. The high-temperature oxygen uptake and oxygen release process for producing O 2 –CO 2 gas mixtures in a fluidized-bed reactor packed with Cu-based oxygen-carrier particles through air separation with carbon dioxide as the purge gas was investigated. Oxygen was absorbed, and heat is stored by the Cu-based oxygen-carrier particles with air being fed. An O 2 –CO 2 stream can be obtained when the fluidized bed was regenerated with carbon dioxide as the fluidizing gas. The O 2 fraction in the O 2 –CO 2 gas mixtures can be controlled by adjusting the reaction temperature, depending upon both thermodynamics and kinetics. Among the three natural Cu ore particles, the particles with a high Cu content experienced a serious agglomeration, while for the particles with a low Cu content, agglomeration did not occur after 20 cycles at a very high temperature (980 °C). This natural Cu ore oxygen carrier offers potential for further study and application in the chemical looping combustion and CLOU processes.
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Wen et al. (2012) studied this question.
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